Premenstrual Syndrome (PMS)

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 7, 2026

Premenstrual syndrome (PMS) is a cyclical cluster of physical and emotional symptoms occurring in the luteal phase of the menstrual cycle and resolving with the onset of menstruation. Common symptoms include bloating, breast tenderness, mood changes, headache, and fatigue. These symptoms recur predictably in relation to ovulation and are absent in the follicular phase.

Standard medicine often treats PMS as an inevitability. RRM treats it as a signal. PMS that is severe, recurrent, or cycle-consistent warrants investigation. In many cases, the underlying driver is luteal phase deficiency: inadequate progesterone production by the corpus luteum following ovulation. Thyroid dysfunction, particularly subclinical hypothyroidism, is another frequent and underdiagnosed contributor.

RRM clinicians evaluate cycle charts alongside serum hormone levels drawn at timed intervals across the luteal phase. This approach distinguishes PMS driven by hormonal deficiency from PMDD (premenstrual dysphoric disorder), a more severe, psychiatrically classified condition. The distinction matters because the treatment pathways differ.⁶⁶

Hilgers documented that women with PMS show significantly decreased luteal phase progesterone, estradiol, and beta-endorphin levels compared to controls, and that cycle-timed hormonal support achieved marked improvement in the majority of cases.⁶⁷

PMS is information. It points toward a hormonal pattern. The clinician's job is to read it.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.